/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors 
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.hisp.dhis.analytics.trackedentity;

import static java.util.stream.Collectors.toList;
import static org.apache.commons.collections4.CollectionUtils.isEmpty;

import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Stream;
import lombok.RequiredArgsConstructor;
import org.apache.commons.lang3.StringUtils;
import org.hisp.dhis.analytics.event.EnrollmentAnalyticsDimensionsService;
import org.hisp.dhis.common.IdentifiableObject;
import org.hisp.dhis.common.PrefixedDimension;
import org.hisp.dhis.program.Program;
import org.hisp.dhis.program.ProgramService;
import org.hisp.dhis.trackedentity.TrackedEntityType;
import org.hisp.dhis.trackedentity.TrackedEntityTypeService;
import org.springframework.stereotype.Service;

@Service
@RequiredArgsConstructor
class DefaultTrackedEntityAnalyticsDimensionsService
    implements TrackedEntityAnalyticsDimensionsService {
  private final TrackedEntityTypeService trackedEntityTypeService;

  private final ProgramService programService;

  private final EnrollmentAnalyticsDimensionsService enrollmentAnalyticsDimensionsService;

  @Override
  public List<PrefixedDimension> getQueryDimensionsByTrackedEntityTypeId(
      String trackedEntityTypeId, Set<String> programUids) {
    TrackedEntityType trackedEntityType =
        trackedEntityTypeService.getTrackedEntityType(trackedEntityTypeId);

    if (Objects.nonNull(trackedEntityType)) {
      Stream<Program> programs;

      if (isEmpty(programUids)) {
        programs = programService.getAllPrograms().stream();
      } else {
        programs = programService.getPrograms(programUids).stream();
      }

      // Dimensions by programs defined on the given tracked entity type
      return programs
          .filter(program -> isDefinedOnTrackedEntityType(program, trackedEntityTypeId))
          .map(
              program ->
                  enrollmentAnalyticsDimensionsService.getQueryDimensionsByProgramId(
                      program.getUid()))
          .flatMap(List::stream)
          .collect(toList());
    }

    return List.of();
  }

  private boolean isDefinedOnTrackedEntityType(Program program, String trackedEntityTypeId) {
    return Optional.of(program)
        .map(Program::getTrackedEntityType)
        .map(IdentifiableObject::getUid)
        .filter(uid -> StringUtils.equals(uid, trackedEntityTypeId))
        .isPresent();
  }
}
